A096424 - OEIS

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A096424 as a simple table

n	a(n)
1	1
2	1
3	4
4	12
5	90
6	1425
7	136135
8	195100084
9	26562489095540
10	5182344411607842435270
11	137655966922842171797061456838751550
12	713380630907065135419001299147560152192298801082595247675

[1,1,4,12,90,1425,136135,195100084,26562489095540, 5182344411607842435270, 137655966922842171797061456838751550, 71338063090706513541900129914756015219229880108259\ 5247675]